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How to reduce road noise

Quiet your car with Dynamat

Jeff has worked in the car audio industry since college and has designed and installed hundreds of car systems. He spent a handful of years at Crutchfield, helping take our company to new heights. After a productive tenure with us, he has moved on to a new challenge, but his enthusiasm and expertise still guide us.

In our final installment in the Car Stereo Proving Ground series, we examine the effects of Dynamat on sound quality. We had better-than-expected results, achieving an incredible 9dB drop in road noise in most situations, and better results over noisy terrain. The Dynamat greatly reduces noise, which in turns makes our music sound more detailed and present.

How to reduce road noise with Dynamat | Video Transcript

Welcome back to the Crutchfield Labs and this ongoing saga with the Ford F-150. We're really trying to define for you, the consumer, where to help spend your money, and what's gonna make the biggest difference. And one of the things that people have always told us is that Dynamat makes a big difference. I believe that as well, but I can't tell you how much of a difference that it really makes. So today we're going to try to validate, now that we've created a baseline in the truck, we're gonna try to validate what difference Dynamat actually does for us.

And the theory is, that if we had done Dynamat along the way, yes, we would have perceived probably and gained incremental value by doing that. However, we couldn't tell you at all on where that actually helps, and what it actually helps. So the plan for today is we're gonna actually get in the vehicle and we're gonna drive around in three real-world scenario driving conditions. We're gonna take the truck on kind of a dirt/gravel road. We're gonna take the truck at normal speeds around, say, 25 to 30 miles an hour around town, and then we're gonna take the truck up to highway speeds, probably around 65 miles an hour.

Alright, so we just took a road trip and what we determined was that certainly, you know, engine noise, road noise, wind noise, other car noise all tends to be in this low frequency.and now you probably understand better why I wanted my slope the way I want it.

This was a quick snapshot we took at about 35 miles an hour, but when we were up to 65 it got a little extended out even a little further — all the way up to 1.25k., even 2k at one point. The point is, we should be able to kill a lot of this with some Dynamat. We're gonna do these pieces at a time. We're gonna do the doors first. Then we're gonna do probably the hood and the floors. And then we're last gonna do the headliner and the really, really, last I guess will be the rear doors.

But, you know, we think that we're gonna be able to see some marked improvement, and hopefully get better SPL out of the system. I expect maybe 1dB. I expect that we'll also get better bass response. I know we'll get less rattles in the system, and it should even have a little more impact from the midrange as well. So hang on.

It certainly doesn't sound like the same truck. This is the noisy bridge. 90. It has literally been a long bumpy road — a long process. I'm kind of tired of taking the seats in and out. But I tell you what, we learned a lot. We learned that basically just having Dynamat in the car killed the road noise and wind noise of standard driving about 9dB. But when we were on gravel roads or bumpy roads, 16dB of noise reduction to the overall sound system. So that's pretty awesome.

What I've also noticed since living with this for a little bit longer is that the response in the mid-bass and the midrange has really jumped. I've gotten a lot more impact and a lot more visceral response out of the doors, which means that we're getting more frequencies. How do I know this? Well, when I went to re-tune the car I actually had to bring several of the midrange frequencies down because they were now out of my target curve. So that's great news. So we're driving the speaker less hard, it's, the enclosure, or the door itself, is actually helping to work a little bit harder, and overall the sound is great.

The best news is, I think we're done for a while, so we're gonna enjoy the system and then we'll be ready for the next round of gear that we want to throw in and test in the mobile lab. Thanks for joining us on this great experiment.

I am 74 and unable to do an installation. Do you have anyone in Sarasota Fl. area that can install for a Camry 2017?

Buck Pomerantz from Crutchfieldon 8/15/2018

Jesse, We don't give installer recommendations because we can't guarantee the quality of their services. I suggest you start with an online search for car stereo installation in Sarasota and research the results, including reviews.

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Janice J.

Posted on 8/11/2017

When I hear the word noise, it reminds me of the overwhelming wind noise that I had to endure in my roadster until I managed to find a good wind deflector to rein that in. Thanks to the Zefferus windscreen, cabin is calm as a clam.

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Buck Pomerantz from Crutchfield

Posted on 5/1/2017

Adi, Adding Dynamat will reduce audible road noise and door reverberation, improving the signal-to-noise ratio of your system. It will not affect the system's tone.

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Adi from Tucson

Posted on 4/28/2017

Hi, i have a 2014 mazda cx5 with the bose sound system that came from the factory.i am worried that adding dynamat as it may mess with the bose that i am guessing was tuned for this car.do i have to worry?

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Buck Pomerantz from Crutchfield

Posted on 1/11/2017

Derek, Jeff's no longer at Crutchfield, so we can't find out what settings he actually used. I assume the meter was set for C weighting and slow response, in order to record the average sound levels of the entire spectrum of noise. I don't know what that DH function is you're referring to. My old analog Radio Shack SPL meter just has the weighting, response, and range controls.

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Derek from Sunnyvale

Posted on 1/11/2017

I have a Radio Shack sound level meter that looks similar to the one you used to measure the sound level in the cab. Can you tell me which settings were used?
Weighting A or C?
Slow response or fast?
DH enabled or disabled?
Other?

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Buck Pomerantz from Crutchfield

Posted on 1/4/2017

Robert, If you check out this article
about Dynamat you can get a better sense of how much you might want. Dynamat comes in kits for doors, floors, general flat panels, hoods and headliners. You can also apply multiple layers of different grade mats for better coverage. In other words, it's hard to say how much will be enough for your car. Just get a lot. While a little Dynamat goes a long way, more is better. Give us a call and an Advisor will help you figure out how much you need.

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Robert J.Kennard from Bremeron

Posted on 1/4/2017

I have 2015 Mitsubishi Mirage de, how much Dynmat do I need to sound prof my entire car from top to bottom even in the spare tire dept.
hood too.

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Buck Pomerantz from Crutchfield

Posted on 8/19/2015

Michael, If you check out the accompanying article about Dynamat you can get a better sense of how much Jeff used in his truck - a lot. Dynamat
comes in kits, Jeff used a door kit for his doors (12 square feet) and a bulk package (72 square feet) for his floor. He also used multiple layers in some places so the actual square footage would be impossible to say. Give us a call and we'll help you figure out how much you'd need for your vehicle.

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Michael from Austin

Posted on 8/19/2015

How many sq.ft did it take to outfit the interior? And, if possible, please break that down into sections: floor, f/r doors, ceiling, etc.

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